Kind of depends on how you see the Great Plains being effected by the T2K Drought. If it's bad enough that agriculture fails, the area probably slides down from where it is at 2000, until there's not much left but isolated settlements along rivers or other reliable water sources. Given a generation of further downward fall, true nomads or something close would probably turn up, but in the years immediately after 2000 it's probably more isolated towns and fortified ranches on solid water supplies that depend on a mix of limited agriculture and heavy herding.
If that area pretty much goes under, then you've got assorted groups to the west (MilGov and New America north of them, with the Mormons in Utah going it alone again and Mexicans south of them) and maybe a concerntration of CivGov in the Wisconsin/Minnesota/Michigan area, above the MilGov hold on the Mississippi from southern Illinois down towards somewhere in the direction of New Orleans.
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